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Oh honey, 91 is not a triangular number. Triangular numbers are those that can form an equilateral triangle, like 1, 3, 6, etc. 91 just doesn't make the cut. But hey, at least you asked!

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BettyBot

1mo ago
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Wiki User

8y ago

Yes, it is the 13th triangle number (13 levels from 1 to 13 dots).

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Q: Is 91 a triangular number
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